Why my items' gone in survival

please, i have a sdmg, terra blade, beetle armor, etc and why are them gone in survival dimension and how do i get 'em back, someone said it was a unique character for survival, i got confused and contacted dark gaming website for help, because, as i said, i got confused. someone help plz

The survival server is reset each Friday. That includes all player characters and the world itself. You’ll have to start over in your progress, as is the case for everyone else.